| A) | Contributed to cognitive theory by observing his three children
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| B) | No evidence supports reinforcement as responsible for language rule systems
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| C) | Young children are intensely interested in their social worlds; early in development they can understand the intentions of other people
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| D) | Children whose parents are on welfare have a smaller vocabulary than do children whose parents are professionals
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| E) | Parents should be active conversational partners with their infants, talk as if their infants understand them, and use language in a style they are comfortable with
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| F) | Studied imitation and deferred imitation by infants
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| G) | Devised the most commonly used infant intelligence test
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| H) | Infants as young as 4 months expect objects to be substantial and permanent
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| I) | Demonstrated detailed memory in 2- to 3-month-old infants
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| J) | Developed a clinical measure to assess potential abnormality in infants
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| K) | Believes humans are biologically prewired to learn language
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| L) | young infants interpret the world as having predictable occurrences
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| M) | Infants whose mothers speak often to them have markedly higher vocabularies
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| N) | Argued that explicit memory does not occur until the second half of first year
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| O) | By the age of 6 months, infants gradually lose the ability to recognize differences in sounds that are not important to their language
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